Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Income Statement [Abstract]
Net sales	$ 1,108.6	$ 1,049.4	$ 2,032.1	$ 2,006.7
Licensing revenue	38.0	38.8	66.9	69.4
Total revenue	1,146.6	1,088.2	2,099.0	2,076.1
Cost of goods sold	455.8	443.5	833.5	840.1
Gross profit	690.8	644.7	1,265.5	1,236.0
Selling, general and administrative expenses	421.2	379.7	798.9	733.7
Depreciation and amortization	48.3	56.4	95.9	106.8
Impairment of long-lived assets	16.3	4.9	16.3	4.9
Restructuring and other charges	5.9	0.0	5.9	0.0
Total operating expenses	491.7	441.0	917.0	845.4
Income from operations	199.1	203.7	348.5	390.6
Other income, net	(0.3)	(0.3)	(0.9)	(0.6)
Interest expense, net	0.8	1.4	1.9	1.7
Foreign currency (gain) loss	(40.5)	0.0	(41.7)	1.3
Income before provision for income taxes	239.1	202.6	389.2	388.2
Provision for income taxes	36.4	41.9	61.0	81.2
Net income	202.7	160.7	328.2	307.0
Less: Net loss attributable to noncontrolling interest	(0.2)	(0.2)	(0.2)	(1.0)
Net income attributable to MKHL	$ 202.9	$ 160.9	$ 328.4	$ 308.0
Weighted average ordinary shares outstanding:
Weighted average ordinary shares outstanding, basic (in shares)	151,781,340	166,695,631	153,134,119	170,427,101
Weighted average ordinary shares outstanding, diluted (in shares)	154,168,094	168,839,967	155,519,806	172,726,859
Net income per ordinary share attributable to MKHL:
Net income per ordinary share, basic (in dollars per share)	$ 1.34	$ 0.97	$ 2.14	$ 1.81
Net income per ordinary share, diluted (in dollars per share)	$ 1.32	$ 0.95	$ 2.11	$ 1.78
Statements of Comprehensive Income:
Net income	$ 202.7	$ 160.7	$ 328.2	$ 307.0
Foreign currency translation adjustments	15.0	(0.3)	37.1	(0.7)
Net (loss) gain on derivatives	(6.4)	(1.3)	(16.1)	1.8
Comprehensive income	211.3	159.1	349.2	308.1
Less: Net loss attributable to noncontrolling interest	(0.2)	(0.2)	(0.2)	(1.0)
Less: Other comprehensive loss attributable to noncontrolling interest	0.0	(0.1)	0.0	0.0
Comprehensive income attributable to MKHL	$ 211.5	$ 159.4	$ 349.4	$ 309.1